@ferdinand Thank you! you can find it in the old coffee help "using matrices" tutorial section:
88c1a768-9234-4fe1-b6eb-c93e4d2ebf6a-grafik.png
My own code is ridicoulusly simple:
main()
{
ang = ( vnorm(vector1) * vnorm(vector2)) ;
}
Just looking for a python "vnorm"